Move host resource from the proxy to the shared_impl.

ppapi/proxy/ppb_font_proxy.cc

Index: ppapi/proxy/ppb_font_proxy.cc
diff --git a/ppapi/proxy/ppb_font_proxy.cc b/ppapi/proxy/ppb_font_proxy.cc
index 6202babc99bb2a118e1ac5601619195207623dc4..392481bac887d65f359ff383b47879acaf011a98 100644
--- a/ppapi/proxy/ppb_font_proxy.cc
+++ b/ppapi/proxy/ppb_font_proxy.cc
@@ -18,6 +18,7 @@
 #include "ppapi/thunk/ppb_image_data_api.h"
 #include "ppapi/thunk/thunk.h"
 
+using ppapi::HostResource;
 using ppapi::StringVar;
 using ppapi::thunk::EnterResourceNoLock;
 using ppapi::thunk::PPB_ImageData_API;
@@ -118,10 +119,6 @@ ppapi::thunk::PPB_Font_API* Font::AsPPB_Font_API() {
   return this;
 }
 
-Font* Font::AsFont() {
-  return this;
-}
-
 PP_Bool Font::Describe(PP_FontDescription_Dev* description,
                        PP_FontMetrics_Dev* metrics) {
   TRACE_EVENT0("ppapi proxy", "Font::Describe");